Connector for a cable for underground mining

Abstract

The invention relates to a connector for a cable for underground mining, comprising a socket part 1 and a plug part axially insertable into the socket part and having a hole in the back for inserting a cable, the plug part being secured to the socket part 1 by a screw cap 20 mounted for rotation on the plug part 10 and screwable on to an external thread 6 on the socket part 1 and being sealed against penetration of moisture and/or dirt by at least one sealing element. In order to obtain standard parts for a family of plugs by a simple assembly process and with maximum sealing-tightness against moisture and dirt and at low production costs, the plugs being suitable for inserting the cable either coaxially or radially, the external thread 6 on the socket part 1 and the associated internal thread 21 on the screw cap 20 are triple threads and/or a crown part 40 with at least one radial recess 41 for receiving the cable 30 is provided on the cable entry hole 18 on the back of the plug part. (FIG. 1 )

1. A connector for a cable for underground mining, comprising a socket part and a plug part axially insertable into the socket part and having a back portion with a hole for inserting a cable, the plug part being secured to the socket part by a screw cap mounted for rotation on the plug part and screwable on to an external thread on the socket part and being sealed against penetration of moisture and dirt by at least one sealing element, in which the external thread on the socket part and an associated internal thread on the screw cap are multiple threads and a crown part with at least one radial recess for receiving the cable having a cable entry hole on the back of the plug part, and a clamping sleeve seated in one of said radial recesses which sleeve receives said cable. 
   
   
     2. A connector according to  claim 1 , in which the crown part has a number of receiving recesses offset from one another by 90° and/or open at the edge. 
   
   
     3. A connector according to  claim 1 , in which the crown part and the plug part are in one piece and preferably in the form of a turned metal part, especially a turned brass part. 
   
   
     4. A connector according to  claim 1 , in which a screen for increasing the electromagnetic shielding is placed on or between the recesses in the crown part and/or additional mechanical reinforcement of the cable, when inserted coaxially, is obtainable by means of the screen or by radially aligned sleeves ( 260 A,  260 C) secured in the recesses. 
   
   
     5. A connector according to  claim 1 , in which a permanently elastic injection moulding which surrounds or fills the cable, cable entry hole and crown part is integrally formed on the plug part. 
   
   
     6. A connector according to  claim 1 , in which the external thread on the socket part and the internal thread on the plug part are triple threads. 
   
   
     7. A connector according to  claim 1 , in which the inner periphery of the screw cap has a peripheral groove for receiving a locking-edge ring or the like for providing the rotatable mounting on the plug part. 
   
   
     8. A connector according to  claim 1 , in which a gap sufficiently large to allow free running and prevent overscrewing of the screw cap is provided between the internal thread and an annular web of the groove facing the internal thread. 
   
   
     9. A connector according to  claim 1 , in which in the assembled state, a sealing ring, especially an O-ring, is placed between the end face of the screw cap and an abutment flange for the screw cap on the socket part and is preferably disposed in a groove between the external thread and the abutment flange. 
   
   
     10. A connector according to  claim 1  in which said sleeve is connected to said armor or said sheath of said cable. 
   
   
     11. A connector according to  claim 5 , in which said plug part is formed with a groove for a sealing ring in the wall portion bounding said cable entry hole.